Smokeless combustion-furnace.



R. STOKER.

SMOKELESS COMBUSTION FURNACE.

APPLICATION FILED APR. 1, 1907.

91 2,201 Patented Feb. 9, 1909.

[l/rrn n ZyG W UNITED STATES PATENT OFFIE.

ROBERT STOKER, OF SALT LAKE CITY, UTAH.

SMOKE LE SS COMBUSTION -FURNACE To all whom "it may concern:

Be it known that I, ROBERT Sroxnn, a citizen of the United States,residing at Salt Lake City, in the county of Salt Lake and State ofUtah, have invented certain new and useful Improvements in SmokelessCombustion-Furnaces, of which the following is a specification.

This invention relates to smokeless combustion furnaces, and especiallyto the class of such furnaoes'having continuous circulation ofsupenheated air.

The invention embodies improvements in certain features of constructiondiffering essentially from those found in otherfurnaces of thischaracter, and in certain operations resulting from such constructionand arrangement of parts, as will be hereinafter fully described andparticularly pointed out in the claims.

The object of the invention is to provide in a smokeless combustionfurnace having air conduits in or under the floor thereof and containingdampers which are operated to supply air partially to a super-heatingair chamber adjacent the fuel chamber and partially to the ash pit ofthe furnace; and to provide a mixing chamber between the superheatingchamber and the combustion chamber of the furnace.

A still further object of the invention is to provide in a smokelesscombustion furnace, a series of dividing walls partially separating thefurnace into four compartments, one of said walls having a super-heatingair chamber therein in communication with the air supply conduits andwith an air and gas mixing compartment which is in communication withthe fuel chamber; and to rovide novel and peculiar means for control ingsaid communications.

In the accompanying drawings forming part of this ap lication: Figure lis a central longitudina sectional view of a furnace embodying myinvention. Fig. 2 is a sectional view taken on the plane indicated bythe dotted line mr, Fig. 1, with the boiler removed. Fig. 3 is a sectiontaken on the plane indicated by the dotted line y Fig. 1. Fig. 4 is adetail section on the line 22, Fig. 1. Fig. 5 is a detail perspectiveview of the casing for the super-heating chamber.

The same reference numerals denote the same parts throughout the severalviews of the drawings.

Specification oi Letters Patent.

Application filed April 1, 1907.

Patented Feb. 9, 1909.

Serial No. 365,729.

The boiler 1 is of the ordinary construction and may be arranged in thefurnace in any suitable manner, and the grate-bars 2,

separate the fire-box into an ash it and a fuel chamber. The grate-barsinc ine from the front of the chamber 8 to a hollow bridge-wall 4. Tothe rear of the wall 4, is a wall 5, projecting from the floor 6 of thefurnace and having an anchored or concaved top, the deepest portion orcenter of which is on a horizontal plane with the top of the wall 4. Thewalls 4 and 5 are spaced apart so as to form an open-top mixing chamber7, having a bottom or door, 8, operated by a hand lever 9 to open andclose the bottom of the chamber 7, for the removal of any deposits inthe chamber 7, or on the said door. The Wall 5 forms the front of acombustion chamber 9, and the rear Wall 10 has a contracted passage orthroat 11, leading from the combustion chamber 9 into the rear end 12 ofthe furnace. By this construction the furnace is divided into foursections which communicate with each other over their separating walls.

Under the floor 6 are a pair of air induction conduits 13, leading fromthe rear of the furnace to the ash pit 1 and the air from such conduitsto the ash pit is controlled by a damper 14, located in each conduit andoperated by a suitable handle 15. The dampers 14 are hung in theconduits 13 under the bridge-wall and forward of the connection betweenthe conduits 13 and the bridge-wall. These dampers may be manipulated toprevent air from flowing from tne conduits 13 into the ash pit, and whenthe dampers are r open to a greater or less degree, two branch outletsfrom the conduits 13 exist, but the effective area of the outlet to thesuper-h eating chamber 16, is not changed, while the area of the outletto the ash pit is changed according to the posit-ion of the damper 14.

A super-heating chamber 16 is formed in and by the bridge-Wall 4, and acasing 17, secured to and forming the rear face and bottom of said wall,and provided with slots, perforations or other suitable passages 18 forthe passage of super-heated air from the chamber 16 to the mixingchamber 7. Leading from the combustion chamber 9, in each wall of thefurnace is a vertical return flue 19, each of which has common with it alongitudinal return fiue 20, in the side walls of the furnace and commonwith a flue in the front wall of the furnace which has openings 21thereing it into a fuel-chamber and an ash-pit, a 30 through from thefront flue into the fuel chamher 3.

Having thus descrihed my invention What I claim as new and desire tosecure by Letters Patent is:

1. In a smoi eless combustion furnace having the usual fire-h OX andgrate-h ars separating it into a fuel-chamh er and an ash-pit, a hollowbridge-wall adjacent the firebox and having end-passages and rearopenings, a

combustion-chamher having an end spaced from the bridge-Wall and formingtherehetween a mixing-cham'i: er, air induction conduits extending fromthe rear end of the furnace under the combustion chamher and thebridge-wall to the ash-pit and communieating with the mixing-ch am; erthrough the bridge-Wall by means of the said end passages, the sideand-front Wails of the furnace having return lines formed therein andleading from the combustion-chamirer to th Y fuel-chamber, and means forvarying the area of the outlet from said channeis to the ash-pit withoutvarying the area of the outlet from these channels to the interior ofthe bridge-wall.

2. In a smokeless combustion furnace having the usual fire-box andgrate-bars separatbridge-wall having air induction passages at the endsthereof and having a superheating chamber therein provided with eductionpassages, a comhustion-chamher having an end wall spaced from the rearof the bridge-wall and therel'iy forming a miXin g-chamber comimunicating with the superheating chamber through the said eductionpassages, air in duction conduits extending from the rear of the furnaceunder all of said. chambers to the ash-pit and communicating with thesuperheating chainh er through the said induction passages of thebridge-wall, the side and front walls of the furnace'having return fluesformed therein and leading from the comhustion-chamher to thefuel-cha1nber, and dampers operated in said channels under thehridgenvall "for varying the area of the outlet from the channeis to theash-pit Without varying the area of the outlet from said channeis to thesuper-heating chamber.

In witness whereof I hereunto set my hand in the presence of twoWitnesses.

ROBERT STOKER.

Witnesses:

WINFIELD S. BOOKER, J. B, EnMoNDs.

